SCCM - Application Catalog - How to retrieve applications installed by the user ?

Hello guys,

Using PowerShell (or GUI) I want to retrieve the application installed by a specific user using the Application Catalog.
I'm able to retrieve the application requests that need an approval via something like:

Get-WMIObject -computerName <SCCM_SERVER> -NameSpace 'root\SMS\Site_<SiteCode>' -class SMS_UserApplicationRequest

But what about the apps that do NOT need an approval ? Where can i find this information ?

Any help would be appreciated Thanks!